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Income (Loss) per Share (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Basic weighted average common shares outstanding (in shares) 874 877 874 876
Dilutive effect of awards granted under our stock incentive plans 1 3 0 3
Diluted weighted average common shares outstanding (in shares) 875 880 874 879
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options with exercise price greater than the average market price 23 6 20 6
Total antidilutive shares 23 6 20 6